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(Classic ASP) Understanding a few ECDSA Public Key FormatsSee more ECC ExamplesDescribes a few ECDSA public key formats.
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% ' Here we have the output of the following openssl command: openssl ec -in key.pem -pubout -text ' Private-Key: (256 bit) ' priv: ' 0e:63:25:8a:73:3c:71:b6:c0:e7:a3:0f:94:b9:74: ' e0:be:bd:46:18:be:40:7e:66:9e:21:99:85:0e:ed: ' 87:2d ' pub: ' 04:5d:1a:4f:d9:bd:49:9e:e4:fd:55:2c:0d:ea:6d: ' b1:66:64:7a:71:91:13:63:86:fe:ca:94:d4:47:51: ' 39:66:ff:43:d5:62:de:f2:f2:41:3c:2e:3f:95:18: ' 2d:23:f7:e7:8e:75:19:3b:c6:50:fb:d9:90:f5:e8: ' 12:b7:b8:6a:43 ' ASN1 OID: prime256v1 ' NIST CURVE: P-256 ' writing EC key ' -----BEGIN PUBLIC KEY----- ' MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET ' Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw== ' -----END PUBLIC KEY----- ' The public key is shown in two different formats. ' The first is this: ' pub: ' 04:5d:1a:4f:d9:bd:49:9e:e4:fd:55:2c:0d:ea:6d: ' b1:66:64:7a:71:91:13:63:86:fe:ca:94:d4:47:51: ' 39:66:ff:43:d5:62:de:f2:f2:41:3c:2e:3f:95:18: ' 2d:23:f7:e7:8e:75:19:3b:c6:50:fb:d9:90:f5:e8: ' 12:b7:b8:6a:43 ' It is the ANSI X9.63 format. ' 65-bytes are the uncompressed public key (04 || X || Y) ' This is the same public key, but in PEM format ' -----BEGIN PUBLIC KEY----- ' MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET ' Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw== ' -----END PUBLIC KEY----- ' It contains ASN.1 that more explicitly identifies the key type. ' ' SEQUENCE (2 elem) ' SEQUENCE (2 elem) ' OBJECT IDENTIFIER 1.2.840.10045.2.1 ecPublicKey (ANSI X9.62 public key type) ' OBJECT IDENTIFIER 1.2.840.10045.3.1.7 prime256v1 (ANSI X9.62 named elliptic curve) ' BIT STRING (520 bit) 000001000101110100011010010011111101100110111101010010011001111011100... ' PEM format can be loaded into a Chilkat public key object like this: ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbPem = Server.CreateObject("Chilkat.StringBuilder") success = sbPem.Append("-----BEGIN PUBLIC KEY-----" & vbCrLf) success = sbPem.Append("MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET" & vbCrLf) success = sbPem.Append("Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw==" & vbCrLf) success = sbPem.Append("-----END PUBLIC KEY-----" & vbCrLf) ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PublicKey") set pubKey1 = Server.CreateObject("Chilkat.PublicKey") success = pubKey1.LoadFromString(sbPem.GetAsString()) If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( pubKey1.LastErrorText) & "</pre>" Response.End End If ' The X9.63 format can be loaded like this: ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbHex = Server.CreateObject("Chilkat.StringBuilder") success = sbHex.Append("04:5d:1a:4f:d9:bd:49:9e:e4:fd:55:2c:0d:ea:6d:") success = sbHex.Append("b1:66:64:7a:71:91:13:63:86:fe:ca:94:d4:47:51:") success = sbHex.Append("39:66:ff:43:d5:62:de:f2:f2:41:3c:2e:3f:95:18:") success = sbHex.Append("2d:23:f7:e7:8e:75:19:3b:c6:50:fb:d9:90:f5:e8:") success = sbHex.Append("12:b7:b8:6a:43") ' Get rid of the ":" chars. numReplaced = sbHex.Replace(":","") ' We'll need to convert hex to base64.. ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData") set bdKey = Server.CreateObject("Chilkat.BinData") success = bdKey.AppendEncoded(sbHex.GetAsString(),"hex") ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.PublicKey") set pubKey2 = Server.CreateObject("Chilkat.PublicKey") success = pubKey2.LoadFromString(bdKey.GetEncoded("base64")) If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( pubKey2.LastErrorText) & "</pre>" Response.End End If ' Let's get the key in pubKey2 as PEM. ' It should be idential to the PEM above. Response.Write "<pre>" & Server.HTMLEncode( pubKey2.GetPem(1)) & "</pre>" ' Here's the output. You can see it's the same as the PEM above.. ' -----BEGIN PUBLIC KEY----- ' MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEXRpP2b1JnuT9VSwN6m2xZmR6cZET ' Y4b+ypTUR1E5Zv9D1WLe8vJBPC4/lRgtI/fnjnUZO8ZQ+9mQ9egSt7hqQw== ' -----END PUBLIC KEY----- %> </body> </html> |
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